#!/usr/bin/python
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#
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# bashreadline Print entered bash commands from all running shells.
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# For Linux, uses BCC, eBPF. Embedded C.
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#
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# This works by tracing the readline() function using a uretprobe (uprobes).
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#
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# Copyright 2016 Netflix, Inc.
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# Licensed under the Apache License, Version 2.0 (the "License")
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#
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# 28-Jan-2016 Brendan Gregg Created this.
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# 12-Feb-2016 Allan McAleavy migrated to BPF_PERF_OUTPUT
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from __future__ import print_function
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from bcc import BPF
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from time import strftime
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import ctypes as ct
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# load BPF program
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bpf_text = """
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#include <uapi/linux/ptrace.h>
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struct str_t {
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u64 pid;
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char str[80];
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};
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BPF_PERF_OUTPUT(events);
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int printret(struct pt_regs *ctx) {
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struct str_t data = {};
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u32 pid;
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if (!PT_REGS_RC(ctx))
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return 0;
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pid = bpf_get_current_pid_tgid();
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data.pid = pid;
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bpf_probe_read(&data.str, sizeof(data.str), (void *)PT_REGS_RC(ctx));
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events.perf_submit(ctx,&data,sizeof(data));
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return 0;
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};
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"""
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STR_DATA = 80
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class Data(ct.Structure):
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_fields_ = [
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("pid", ct.c_ulonglong),
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("str", ct.c_char * STR_DATA)
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]
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b = BPF(text=bpf_text)
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b.attach_uretprobe(name="/bin/bash", sym="readline", fn_name="printret")
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# header
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print("%-9s %-6s %s" % ("TIME", "PID", "COMMAND"))
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def print_event(cpu, data, size):
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event = ct.cast(data, ct.POINTER(Data)).contents
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print("%-9s %-6d %s" % (strftime("%H:%M:%S"), event.pid,
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event.str.decode('utf-8', 'replace')))
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b["events"].open_perf_buffer(print_event)
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while 1:
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b.perf_buffer_poll()
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